Carbon-based cages with hollow confined structures for efficient microwave absorption: State of the art and prospects

Xu, Lijia; Lin, Zhenyang; Chen, Yanjun; Fan, Zeng; Pei, Xinrui; Yang, Song; Kou, Xin; Wang, Yuchao; Zou, Zhiyong; Xi, Ding; Peng, Yin; Su, Gehong; Zhou, Man; Dai, Jianwu; Pan, Lujun; Zhao, Yuechao

doi:10.1016/j.carbon.2022.10.015

Cited by 49 publications

(6 citation statements)

References 210 publications

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“…The D peak, which measures 1350 cm –1 , and the G peak, which measures 1588 cm –1 , are the two distinct peaks. The D-band is associated with imperfections and lattice distortion, whereas the G-band results from the in-plane oscillation of sp 2 carbon atoms. , I D / I G values for S1, S2, S3, and S4 were 1.06, 1.16, 1.24, and 2.61, respectively. It is believed that when the N-CNT content grows, the degree of graphitization of SnS/N-CNTs decreases and a considerable number of carbon defects emerge, which is beneficial for increasing polarization loss.…”

Section: Resultsmentioning

confidence: 95%

Sea Urchin-like SnS/Nitrogen-Doped Carbon Nanotube Dielectric Composites for Tunable Electromagnetic Response

Xiong,

Kou,

Zuo

et al. 2023

ACS Appl. Nano Mater.

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Owing to the unique energy band structure, semiconductor property, and adjustable morphology of two-dimensional SnS nanomaterials, it is extremely practical to employ them as dielectric microwave absorbers. However, electrical conductivity restricts the dielectric characteristic of SnS, resulting in a higher filling rate in real-world applications. Herein, sea urchin-like SnS/N-doped carbon nanotube (N-CNT) heterogeneous frameworks are fabricated by using the self-assembly solvothermal method to further upgrade the performance of SnS-based microwave absorbers. The flower-like SnS nanosheets are chained by way of one-dimensional conductive N-CNTs to shape three-dimensional (3D) hierarchical composites. In particular, the frameworks with a cross-linking nanoarchitecture provide an effective path to boost the conductive loss. Meanwhile, SnS nanosheets in the form of flowers with unique semiconductor properties offer a lot of polarization active sites, which encourage polarization loss. Furthermore, by optimizing the ratio of SnS and N-CNTs, the dielectric characteristics and impedance matching of the composites may be efficiently adjusted. The results certify that optimized SnS/N-CNT heterogeneous nanoframeworks exhibit thin thickness, lightweight, and strong absorption characteristics, which are recommended as promising microwave absorbers.

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Section: Resultsmentioning

confidence: 95%

Sea Urchin-like SnS/Nitrogen-Doped Carbon Nanotube Dielectric Composites for Tunable Electromagnetic Response

Xiong,

Kou,

Zuo

et al. 2023

ACS Appl. Nano Mater.

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“…[ 21 ] As shown in Figure 2h, the two peaks located at 706.4 and 710.4 eV correspond to Fe 3 C and Fe, while the other two peaks are oxidation peaks. [ 9b,22 ] The O 1s spectrum is shown in Figure 2i, where the O 1 peak at 529.5 eV is attributed to lattice oxygen in metal oxides, the O 2 peak at 531.7 eV is associated with oxygen vacancies, and the O 3 peak at 532.8 eV corresponds to surface absorption oxygen. [ 1c,23 ] The presence of oxides and oxygen vacancies is beneficial to improve the polarization loss capability in EMW absorption.…”

Section: Resultsmentioning

confidence: 99%

Boosting Conductive Loss and Magnetic Coupling Based on “Size Modulation Engineering” toward Lower‐Frequency Microwave Absorption

Guo,

Duan,

Liu

et al. 2023

Small

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The rational design of absorber size is a promising strategy for obtaining excellent electromagnetic wave (EMW) absorption performance. However, achieving controllable tuning of the material size through simple methods is challenging and the associated EMW attenuation mechanisms are still unclear. In this study, the sizes of metal–organic frameworks (MOFs) are successfully tailored by changing the growth time and the molar ratio of iron (Fe)/organic ligands. The lateral and vertical lengths of MOFs vary in the range of 200 nm to 2 µm and 100 nm to 1 µm, respectively. Both experiments and simulations confirm that the decrease of MOF size favors the formation of more conductive networks, which is beneficial for improving the conductivity loss. Meanwhile, the micromagnetic simulation reveals that the magnetic coupling can be effectively enhanced by the decrease of MOF size, which is conducive to the improvement of magnetic loss, especially in low‐frequency range. The reflection loss of Fe‐based MOFs with optimized size reaches −46.4 dB at 6.2 GHz with an effective absorption bandwidth of 3.1 GHz. This work illustrates the important role of size effect in EMW dissipation and provides an effective strategy for enhancing the low‐frequency EMW absorption performance.

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“…The attenuation characteristics of absorption materials are typically expressed through the attenuation constant α , with a higher α indicating a greater ability of the absorption material to diminish incident EMW [ 35 , 36 , 37 ]. In general, the α value can be expressed by the following equation:

…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Cobalt Particles and Investigation of Their Electromagnetic Wave Absorption Characteristics

Li,

Sheng

et al. 2023

Materials

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As the integration technology for integrated circuit (IC) packaging continues to advance, the issue of electromagnetic interference in IC packaging becomes increasingly prominent. Magnetic materials, acknowledged for their superior electromagnetic absorption capabilities, play a pivotal role in mitigating electromagnetic interference problems. In this study, we employed a liquid-phase reduction method. We prepared three types of cobalt (Co) particles with distinct morphologies. Through variations in the synthesis process conditions, we were able to control the aspect ratio of protrusions on the surface of the Co particles. It was found that the sword-like Co particles exhibit superior electromagnetic wave absorption capabilities, showing a reflection loss value of up to −50.96 dB. Notably, when the coating thickness is only 1.6 mm, the effective absorption bandwidth is extended up to 7.6 GHz. The spatially expansive sword-like Co particles, with their unique structure featuring dipole polarization and interfacial polarization, demonstrated enhanced dielectric and magnetic loss capabilities, concurrently showcasing superior impedance-matching performance.

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Carbon-based cages with hollow confined structures for efficient microwave absorption: State of the art and prospects

Cited by 49 publications

References 210 publications

Sea Urchin-like SnS/Nitrogen-Doped Carbon Nanotube Dielectric Composites for Tunable Electromagnetic Response

Sea Urchin-like SnS/Nitrogen-Doped Carbon Nanotube Dielectric Composites for Tunable Electromagnetic Response

Boosting Conductive Loss and Magnetic Coupling Based on “Size Modulation Engineering” toward Lower‐Frequency Microwave Absorption

Synthesis of Cobalt Particles and Investigation of Their Electromagnetic Wave Absorption Characteristics

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